The Chem-Tainer 112 Gallon PE Rectangular Open Top Tank is a polyethylene rectangular open-top vessel built for water storage, batching, and process holding where you need full top access to the liquid. With the top open, you can drop in mixers, dip tubes, fill hoses, or level instrumentation without working around a closed dome. This is the format people search for as a rectangular open top tank when they want a flat-sided footprint that sits efficiently against a wall or inside a containment curb instead of a round drum that wastes floor space.
Will it work for your application?
This tank holds 112 gallons of water. The rectangular open-top geometry makes it straightforward to set against walls, line up in a row, or drop inside secondary containment, and the open top keeps the full contents reachable for cleaning, manual dosing, or visual level checks. Confirm your actual liquid volume against the 112-gallon capacity before ordering. To match tank size to your daily and surge demand, use the Tank Sizing Calculator and the Tank Sizing Guide. Check the technical drawing on this page for exact outside length, width, and wall height so you can verify floor footprint, curb clearance, and headroom for any lid, agitator, or overhead fill before you build the stand or pad.
Plan the full-water weight
Filled with water this tank carries roughly 934 lb of liquid load, which confirms it is loaded for standard 1.0 specific-gravity water at about 8.34 lb per gallon. That weight drives your foundation decisions: an open rectangular tank needs a flat, fully supported, level base under the entire bottom, and a poured pad is the safe default at this load. For pad design, see our guide on concrete pad sizing for above-ground polyethylene tanks. Size the foundation for the full-water condition even if you normally run the tank partially filled.
The mistake to avoid
The most common error with an open-top water tank is treating it like a chemical tank. This unit is rated and loaded for 1.0 SG water, so anything heavier than water, or any chemical service, requires a tank whose resin and specific-gravity rating are matched to your exact chemical, concentration, and temperature. That data is not part of this water-service listing, and you should never assume any polyethylene tank handles any liquid. If your liquid is heavier than water or chemically aggressive, Chem-Tainer makes higher-SG chemical-rated tanks (1.5 and 1.9 SG) in cone-bottom and closed formats. Our comparison of Chem-Tainer cone-bottom tanks at 30 degrees versus 45 degrees covers drainage and solids handling for those duties, or call 866-418-1777 to spec the correct higher-SG tank. The open top also means you should plan for cover, screening, or freeze protection where the install demands it; if this feeds a fire reserve or sits in a cold climate, our guide on fire-water reservoir tank design and freeze protection covers the engineering for open-water storage.
This tank ships LTL freight from the nearest stocking plant - Hummelstown, PA or West Babylon, NY - with the rate quoted live to your ZIP code. The Freight Cost Estimator auto-selects the nearer plant for your ZIP and returns a live rate, or call 866-418-1777 and we will help you confirm dimensions, plan the foundation, and place the order.
